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A dielectric union from Grainger can reduce corrosion caused by galvanic action between two different metals because it provides insulation between the two sides of the union. Shop here for dielectric unions in a wide range of sizes and metal combinations, including copper and iron, galvanized steel and malleable iron, steel and brass and more. Choose the type of connection you need. When you shop Grainger today, pick up a dielectric union and whatever other plumbing supplies you need.